AMIS-42673 Datasheet, PDF (9/11 Pages) AMI SEMICONDUCTOR – High Speed CAN Transceiver

AMIS−42673
TxD
HIGH
LOW
CANH
CANL
V_i(dif) =
V_CANH − V_CANL
0.9V
0.5V
dominant
recessive
RxD
t_{d(TxD−BUSon)}
t_{pd(rec−dom)}
0.3 x V₃₃
t_{d(TxD−BUSoff)}
t_{d(BUSon−RxD)}
t_{pd(dom−rec)}
0.7 x V33
t_{d(BUSoff−RxD)}
Figure 6. Timing Diagram for AC Characteristics
PC20040829.6
+3.3 V
+5 V
V_CC
V₃₃
100 nF
3
TxD
1
8
7 ^CANH
Generator
RxD
20 pF
AMIS−
6
42673
4
5
2
GND
CANL
30 W
V_REF
6.2 kW
10 nF
Active Probe
6.2 kW
30 W
Spectrum Anayzer
47 nF
Figure 7. Basic Test Setup for Electromagnetic Measurement
PC20071003.6
CANH
CANL
V_CM =
0.5*(V_CANH+V_CANL)
V_CM−step
recessive
V_CM−peak
V_CM−peak
PC20040829.7
Figure 8. Common−Mode Voltage Peaks (See Measurement Setup Figure 7)
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